Citing unnamed sources close to the Institute of National Remembrance (IPN), which prosecutes crimes from the communist-era and from the Nazi occupation, the PAP said today a team of forensic experts had come to that conclusion notably through handwriting analysis.
The 73-year-old former president and Nobel Peace laureate has been battling the allegations since last year, when the IPN seized previously unknown secret police files from the widow of a communist-era interior minister.
Walesa, who co-founded the independent Solidarity union and then negotiated a bloodless end to communism in Poland in 1989, has repeatedly denied the authenticity of the documents and once again called the accusations a "lie" yesterday.
He enigmatically admitted however last year to having "made a mistake" and in the past had said he signed "a paper" for the secret police during one of his many interrogations.
A book published by the IPN in 2008 alleged that while the regime registered Walesa as a secret agent in December 1970, he was cut loose in June 1976 due to his "unwillingness to cooperate".
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